Space vector modulation for vienna-type rectifiers based on the equivalence between two- and three-level converters: A carrier-based implementation

This paper presents the equivalence between two-and three-level converters for the Vienna rectifier, proposing a simple and fast space vector modulator built on this principle. The algorithm is further simplified by deriving its carrier-based equivalent implementation, which enables the midpoint voltage control by adjusting the ratio between redundant vectors, while also addressing the voltage-current polarity constraints of this non-regenerative three-level rectifier. The latter is achieved by employing a simple two-level overmodulation algorithm, which also extends the operating range of the Vienna rectifier if required. The proposed algorithm also complements previous carrier-based space vector modulators developed for the three-level neutral-point-clamped inverter, providing the midpoint balancing capability for these schemes. Experimental results obtained with a 2 kW 40 kHz 200 Vdc DSP/FPGA controlled Vienna rectifier prototype are presented for verification purposes.